JEE Main 2021ChemistryChemical KineticsMediumNumerical

JEE Main 2021 — Chemical Kinetics Question with Solution

JEE Main 2021 (17 Mar Shift 2)

Question

The reaction 2 A+B2→2AB is an elementary reaction.

For a certain quantity of reactants, if the volume of the reaction vessel is reduced by a factor of 3, the rate of the reaction increases by a factor of _____ . (Round off to the Nearest Integer).

Enter your answer

Show full solutionCorrect answer: 27
Correct answer
27

Step-by-step explanation

Reaction : 2 A+B2⟶2AB

As the reaction is elementary, the rate of reaction is

r=K.[A]2 B2

on reducing the volume by a factor of 3, the concentrations of A and B2 will become 3 times and hence, the rate becomes 32×3=27 times of initial rate.

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About this question

This is a previous-year question from JEE Main 2021, covering the Chemical Kinetics chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.